...asking him to lead a mutiny against her teachers.
Back in '07 Johnny Depp's daughter had kidney failure. She was hospitalized in a children's hospital in London.Or the school was contacted by the people who do publicity for PotC and agreed to such a publicity stunt. Especially since there is a fourth movie that will be released in the near future. This is a great way to remind people of the series and a great way for a school to get it's name in the news and get all kinds of free publicity and other goodies that go with it (the studio prob gave the school all kinds of stuff, etc....).
Brilliant way to cover the visit and free gifts by responding to a letter requesting a mutiny.